CN1241259A - Instrument for measuring voltages of cells - Google Patents
Instrument for measuring voltages of cells Download PDFInfo
- Publication number
- CN1241259A CN1241259A CN98801435A CN98801435A CN1241259A CN 1241259 A CN1241259 A CN 1241259A CN 98801435 A CN98801435 A CN 98801435A CN 98801435 A CN98801435 A CN 98801435A CN 1241259 A CN1241259 A CN 1241259A
- Authority
- CN
- China
- Prior art keywords
- differential amplifier
- voltage
- cells
- instrument
- secondary cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
Abstract
This invention discloses differential amplifiers (2) to each of the batteries (1) for obtaining output voltages corresponding to the two terminal voltages of each battery (1). These differential amplifiers (2) are divided into groups (5) of a suitable number, and for each group (5), mutually insulated ground terminals (6) and mutually insulated control power sources (7) are provided. Each control power source (7) is connected between the power source terminal (2a) of each differential amplifier (2) and each ground terminal (6) of the respective group (5).
Description
Technical field
The present invention relates to instrument for measuring voltages of cells, particularly be applicable to the instrument for measuring voltages of cells that each secondary cell voltage of the supply unit of a plurality of secondary cells that are connected in series is measured.
Background technology
For example, in the supply unit of electric automobile etc.,, adopt the structure of a plurality of secondary cells that are connected in series for the driving voltage that obtains stipulating, but, be necessary positively constantly to hold the state of each secondary cell in order stably to guarantee the reliability of this supply unit.Therefore, the known instrument for measuring voltages of cells that the both end voltage that is provided for measuring each secondary cell is arranged.
As shown in Figure 4, in this instrument for measuring voltages of cells in the past, with obtain corresponding to the differential amplifier 12 of the output voltage of its both end voltage and the gain calibration amplifier 13 that this output voltage is carried out gain calibration be connected at each secondary cell 11.As shown in Figure 5, in order to detect the voltage of each secondary cell 11, adopt such structure, be about to be transformed into digital quantity with the A/D transducer 14 that should be provided with respectively, and will be input in the microcomputer 15 corresponding to the digital signal of the both end voltage of each secondary cell 11 from the output voltage of each gain calibration amplifier 13.In addition, as shown in Figure 4,, common control power supply is connected between its power end and the earth terminal, adds power source voltage Vcc, simultaneously earth terminal is connected on the common ground GND for common respectively its power end and the earth terminal of connecting of whole differential amplifier 12.
Here, gain calibration amplifier 13 is connected the reasons are as follows of the gain calibration carried out separately with each differential amplifier 12.For with the digital difference of the output voltage conversion of differential amplifier 12 and deliver in the microcomputer 15, the gain of differential amplifier 12 and the possible input voltage range of A/D transducer 14 are adapted.For example, if the sensing range of cell voltage is 0～20V, the input voltage range of A/D transducer 14 is 0～5V, then must cell voltage be transformed into 1/4 times with differential amplifier 12 and export.
, the homophase input range being arranged in differential amplifier 12, is to add that on input end voltage carries out the voltage range of regular event, is restricted corresponding to the voltage range of Devices Characteristics and supply voltage input.For example, when differential amplifier 12 used certain device, power source voltage Vcc was+situation of 15V under, the homophase input range is 14V.This homophase input range is different because of the device that constitutes differential amplifier 12, be generally than power source voltage Vcc+value that 15V is low a little, getting this value is 14V.On the other hand, as shown in Figure 6, because of a plurality of secondary cells 11 are connected in series, so the relative ground connection of voltage Va of an end of certain secondary cell 11 for example is 200V sometimes, even in this case, input voltage Vb also must be no more than the 14V as the homophase input range.Therefore, the R1 of Fig. 6 and R2 must satisfy R2/R1≤14/ (200-14), and the gain of this occasion differential amplifier 12 is below R2/R1 (=7/93).Therefore, for the input range with described A/D transducer adapts, it is the gain calibration amplifier 13 of R1/4R2 (=93/28) that gain must be arranged.
But problem is, in aforementioned structure in the past, because of must be to each differential amplifier 12, promptly each secondary cell 11 is provided with gain calibration amplifier 13, so cost is very high.
In addition, there is dark current to flow through in differential amplifier 12 sides that are provided with to being respectively applied for voltage determination from secondary cell 11.If this dark current is big, then problem is, can not cause overdischarge under the situation of placing there be for a long time charging and causes performance degradations such as battery capacity minimizing and internal resistance increase.Problem in addition is, between the secondary cell 11 that is connected in series, when there is difference in dark current, then the capacity error between each secondary cell increases, if only the intermediate value of estimated capacity is controlled, the battery that then has overcharges and overdischarge, so and must be unlikely to have this mistake to discharge and recharge when using to make it use allowed band to reduce.When other problem was not placed owing to not charging for a long time in addition, residual capacity differed in size, and the secondary cell that capacity reduces can cause other secondary cell further to discharge, and causes degradation of cell performance.Therefore problem is, reduce dark current, reduces the difference of dark current between each secondary cell 11.
But, in aforementioned structure, because of each differential amplifier 12 is connected on the common ground GND, so its equivalent electrical circuit is shown in Fig. 3 (b).Figure 3 illustrates the example of the occasion of 9 secondary cells 11 that are connected in series, the cell voltage of representing each secondary cell 11 with VB1～VB9, R represents the equiva lent impedance of differential amplifier 12 sides, I1～I9 represents the dark current from each secondary cell 11, for example, suppose that VB1～VB9 is 15V, R is 1M Ω, I1=I9=67.5 μ A then, I2=I8=120.0 μ A, I3=I7=157.5 μ A, I4=I6=180.0 μ A, I5=187.5 μ A, the dark current maximum of each secondary cell 11 can be as big as 180.0 μ A, and the poor maximum of dark current can reach 120 μ A (this can reach maximum dark current value 180.0 μ A 67%), can not solve the problem of aforementioned problems.
The present invention, in view of aforementioned problem in the past, its purpose is to provide a kind of cell voltage settler, this device can be provided with the gain calibration amplifier for the differential amplifier of measuring each cell voltage, so that can reduce cost, reduce dark current, and reduce its difference.
Summary of the invention
Instrument for measuring voltages of cells of the present invention, be in the instrument for measuring voltages of cells that the voltage separately of a plurality of batteries of being connected in series is measured, each battery is provided with differential amplifier, obtain output voltage corresponding to its both end voltage, and the differential amplifier of suitable number divided into groups, the earth terminal of mutually insulated is set in each group, the control power supply of mutually insulated is set simultaneously, and each control power supply is connected between the power input and earth terminal of each differential amplifier of each group.
Because of the differential amplifier of each group is connected between power input and the earth terminal will controlling power supply under the state of mutually insulated, so the voltage that is added on the input end of each differential amplifier in each group is lower with respect to each earth terminal, therefore, the gain setting range broadening and the unnecessary gain calibration amplifier that is provided with, can reduce cost, in addition, because of organizing interior differential amplifier number and ground connection by means of reducing each, can reduce maximum dark current value, even and not have for a long time charging and placement also is difficult to cause the deterioration of battery, simultaneously also can reduce the difference of dark current value, so needn't dwindle the usable range of battery, also can prevent overcharging and overdischarge of battery.
Its result can directly link to each other the output terminal of each differential amplifier with the A/D shift means that output voltage signal is carried out analog to digital conversion, and the A/D shift means can be connected with the means that detect cell voltage according to its output signal.
In addition, aforementioned battery is not limited to be made up of single battery unit, can certainly be to connect a plurality of battery units and the module that forms.
Brief Description Of Drawings
Fig. 1 represents the key component structural drawing of the instrument for measuring voltages of cells of the present invention's one example.
Fig. 2 represents the integral body signal pie graph with respect to 1 battery part of the instrument for measuring voltages of cells of same example.
Fig. 3 is same example and the key diagram of the dark current of example in the past.
Fig. 4 represents the key component structural drawing of the instrument for measuring voltages of cells of example in the past.
Fig. 5 represents the integral body signal pie graph with respect to 1 battery part of the instrument for measuring voltages of cells of same example in the past.
Fig. 6 is the key diagram of the setting gain of the same differential amplifier of example in the past.
The best mode that carries out an invention
Below, with reference to Fig. 1～Fig. 3 an example of implementing instrument for measuring voltages of cells of the present invention is described.
In Fig. 1, the 1st, as the secondary cell of the battery of determination object, be the secondary cell of a plurality of (for example 6) battery unit composition module of being connected in series.By means of a plurality of this secondary cells 1 that are connected in series, constitute electric automobile and other supply unit.
The 2nd, be used to detect the both end voltage of each secondary cell 1 and the differential amplifier that is connected with each secondary cell 1.With the differential amplifier 2 of every suitably number, in illustrated example, be divided into one group for per 3, and formation group 5 (5-1～5-n).And, to each group be provided with mutually insulated earth terminal 6 (6-1～6-n), and respectively separately ground connection (GND1～GNDn) is provided with control the power supply 7 ((VCC1～VCCn) of 7-1～7-n) of mutually insulated simultaneously.Respectively each is controlled power supply 7 (7-1～7-n) be connected with power transformer by insulated type DC/DC transducer.And (7-1～7-n) is connected the power input 2a of each differential amplifier 2 and the earth terminal 6 of correspondence (between the 6-1～6-n) with it with each control power supply 7.
In Fig. 2, each differential amplifier 2 directly is connected with A/D transducer 3.A/D transducer 3 is transformed into digital signal with the output signal of differential amplifier 2, and to microcomputer 4 outputs.The 4th, go out the microcomputer of the both end voltage of each secondary cell 1 according to the digital signal detection of input.
In aforesaid structure, the both end voltage of each secondary cell 1 is input in the differential amplifier 2, to be input in the A/D transducer 3 corresponding to the output voltage signal (simulating signal) of the both end voltage of each secondary cell 1, and be transformed into digital signal, and to microcomputer 4 outputs with A/D transducer 3.The time for reading that microcomputer 4 usefulness are necessary becomes magnitude of voltage with the digital signal conversion of importing, and detects the both end voltage of secondary cell 1 according to this magnitude of voltage.Like this, because of output voltage, can often positively hold the state separately of each secondary cell 1, so can stably guarantee the reliability of supply unit by means of each secondary cell 1 of the supply unit that detects a plurality of secondary cells 1 that are connected in series.
In this example, because of the aforementioned differential amplifier 2 with right quantity is divided into one group, divide 5-1～5-n in groups, will (7-1～7-n) be connected the earth terminal 6 of each group 5-1～5-n mutually insulated state ((GND1～GNDn) and between the power input 2a of its each differential amplifier 2 of 6-1～6-n) to each control power supply 7 of organizing mutually insulated, each group is added that (VCC1～VCCn), ((voltage of GND1～GNDn) reduces control voltage for 6-1～6-n) with respect to separately earth terminal 6 so respectively organize voltage (the voltage Va of Fig. 6) on the input end that is added in each differential amplifier 2 in 5-1～5-n.Therefore, the gain setting scope broadening of differential amplifier 2, therefore the unnecessary gain calibration amplifier that is provided with in the example in the past that is arranged on, can reduce cost significantly.
In addition, by means of the quantity (being 3) that reduces the differential amplifier 2 in each group 5, then supply with dark current in this example by the equivalent electrical circuit shown in Fig. 3 (a).That is to say, the cell voltage of representing each secondary cell 1 with VB1～VB9, R represents the equiva lent impedance of differential amplifier 2 sides, I1～I9 represents the dark current from each secondary cell 1, for example, suppose that VB1～VB9 is 15V, R is 1M Ω, I1=I3=I4=I6=I7=I9=22.5 μ A then, I2=I5=I8=30.0 μ A, the dark current of each secondary cell 1 is 30.0 μ A to the maximum, compared with the pastly reduce significantly, and the difference of dark current is 7.5 μ A (maximum dark current value 30.0 μ A 25%) to the maximum.
Therefore, dark current value reduces, even and not have for a long time charging and placement also is difficult to cause the deterioration of battery.In addition, the difference of dark current value also is reduced to 25% of maximum dark current value, and the usable range that can needn't dwindle battery also can prevent overcharging and overdischarge of battery, and the overdischarge that produces owing to the residual capacity difference can not take place simultaneously yet.
Industrial practicality
As previously mentioned, adopt the present invention, then needn't gain calibration amplifier, energy be set for each difference amplifier Reduce cost. In addition, owing to can reduce maximum dark current value and also can reduce its difference, so that in order to prevent The scope of application of the overdischarge that produces owing to the residual capacity difference of battery, the battery set of overcharging is more widened, So the instrument for measuring voltages of cells as supply unit is useful.
Claims (2)
1. an instrument for measuring voltages of cells is measured a plurality of batteries voltage separately that is connected in series, it is characterized in that,
Each battery (1) is provided with differential amplifier (2), obtain corresponding to its both end voltage, the differential amplifier (2) of suitable number is divided into groups, the earth terminal (6) of mutually insulated is set in each group (5), the control power supply (7) of mutually insulated is set simultaneously, and each control power supply (7) is connected between the power input (2a) and earth terminal (6) of each differential amplifier (2) of each group (5).
2. instrument for measuring voltages of cells as claimed in claim 1 is characterized in that,
The output terminal of each differential amplifier (2) directly is connected with the A/D shift means (3) that output voltage signal is carried out analog to digital conversion, A/D shift means (3) is connected with the means (4) that detect cell voltage according to its output signal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26606597A JP3863262B2 (en) | 1997-09-30 | 1997-09-30 | Battery voltage measuring device |
| JP266065/97 | 1997-09-30 | ||
| JP266065/1997 | 1997-09-30 | ||
| PCT/JP1998/004438 WO1999017123A1 (en) | 1997-09-30 | 1998-09-30 | Instrument for measuring voltages of cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1241259A true CN1241259A (en) | 2000-01-12 |
| CN1162711C CN1162711C (en) | 2004-08-18 |
Family
ID=17425890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB988014351A Expired - Lifetime CN1162711C (en) | 1997-09-30 | 1998-09-30 | Instrument for measuring voltages of cells |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6147499A (en) |
| EP (1) | EP0943926B1 (en) |
| JP (1) | JP3863262B2 (en) |
| KR (1) | KR100480911B1 (en) |
| CN (1) | CN1162711C (en) |
| DE (1) | DE69804935T2 (en) |
| WO (1) | WO1999017123A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350261C (en) * | 2001-05-29 | 2007-11-21 | 水吉能公司 | Fuel cell votage monitoring system and its method |
| CN100449322C (en) * | 2003-04-29 | 2009-01-07 | 泰拉丁公司 | Measurement circuit with improved accuracy |
| CN100460877C (en) * | 2004-02-23 | 2009-02-11 | 罗姆股份有限公司 | Voltage detecting circuit and battery device using same |
| CN101043094B (en) * | 2006-03-23 | 2011-04-06 | 株式会社京浜 | Battery voltage measurement circuit and battery electric control unit |
| CN101185005B (en) * | 2005-05-27 | 2011-04-20 | Lg化学株式会社 | Method and apparatus of detecting voltage for battery pack |
| CN102520231A (en) * | 2011-12-15 | 2012-06-27 | 大连理工大学 | Detection circuit of switch magnetic resistance motor winding voltage and detection method thereof |
| CN104813178A (en) * | 2012-11-15 | 2015-07-29 | 康奈可关精株式会社 | Voltage measurement circuit |
| CN105378499A (en) * | 2013-07-15 | 2016-03-02 | 古河电气工业株式会社 | Secondary battery state detection device and secondary battery state detection method |
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|---|---|---|---|---|
| US6166549A (en) * | 1998-12-31 | 2000-12-26 | Daimlerchrysler Corporation | Electronic circuit for measuring series connected electrochemical cell voltages |
| US6313750B1 (en) * | 1999-08-23 | 2001-11-06 | Plug Power Inc. | Measuring cell voltages of a fuel cell stack |
| JP3430083B2 (en) | 1999-10-21 | 2003-07-28 | 本田技研工業株式会社 | Battery voltage measuring device |
| JP4210030B2 (en) | 2000-11-02 | 2009-01-14 | パナソニック株式会社 | Laminate voltage measuring device |
| KR20030089899A (en) * | 2002-05-20 | 2003-11-28 | 현대자동차주식회사 | Battery voltage measurement apparatus of battery management system |
| US6777946B2 (en) * | 2002-07-01 | 2004-08-17 | Honeywell International Inc. | Cell buffer with built-in test |
| US20050057219A1 (en) * | 2003-09-17 | 2005-03-17 | Cellex Power Products, Inc. | Apparatus and method for cell voltage monitoring |
| JP4179205B2 (en) * | 2004-03-29 | 2008-11-12 | サンケン電気株式会社 | Voltage measuring device |
| US7622893B2 (en) | 2007-03-13 | 2009-11-24 | Linear Technology Corporation | Method and apparatus for measuring the voltage of a power source |
| DE102007061539A1 (en) * | 2007-12-20 | 2009-07-02 | Continental Automotive Gmbh | Monitoring circuit for an energy storage and method for monitoring an energy storage |
| CN101509941B (en) * | 2008-12-31 | 2012-06-13 | 中兴通讯股份有限公司 | Accumulator anti-theft device, method and accumulator theftproof system in communication network |
| JP5717282B2 (en) | 2011-02-28 | 2015-05-13 | 矢崎総業株式会社 | Voltage detector and dark current variation reducing method |
| KR101268847B1 (en) * | 2011-12-29 | 2013-06-04 | 한국항공우주연구원 | Apparatus and method for measuring battery cell voltage |
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| CA1295011C (en) * | 1986-12-23 | 1992-01-28 | Warren T. Whitmire | Battery monitoring and condition indicator system for multi-battery pack |
| US5287286A (en) * | 1989-07-31 | 1994-02-15 | Kabushiki Kaisha Toshiba | Low-battery state detecting system and method for detecting the residual capacity of a battery from the variation in battery voltage |
| CA2018639A1 (en) * | 1990-06-08 | 1991-12-08 | James D. Blair | Method and apparatus for comparing fuel cell voltage |
| US5302902A (en) * | 1991-04-26 | 1994-04-12 | The United States Of America As Represented By The Secretary Of The Army | Abnormal battery cell voltage detection circuitry |
| JP2593253B2 (en) * | 1991-05-29 | 1997-03-26 | 富士通株式会社 | Current measurement circuit |
| JPH08140206A (en) * | 1994-11-09 | 1996-05-31 | Fuji Heavy Ind Ltd | Battery managing method for electric motor vehicle |
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| KR0144931B1 (en) * | 1995-01-27 | 1998-08-17 | 윤종용 | Battery voltage measurement apparatus |
| WO1996032651A1 (en) * | 1995-04-10 | 1996-10-17 | Hino Jidosha Kogyo Kabushiki Kaisha | Voltage detector |
| JP3293410B2 (en) * | 1995-06-09 | 2002-06-17 | 松下電器産業株式会社 | Battery monitoring device |
| JP3339252B2 (en) * | 1995-06-14 | 2002-10-28 | 松下電器産業株式会社 | Battery monitoring device |
| KR970002337A (en) * | 1995-06-30 | 1997-01-24 | 김광호 | Battery remaining capacity measuring method and device |
| JP3424413B2 (en) * | 1995-12-04 | 2003-07-07 | 日産自動車株式会社 | Overvoltage detection device for assembled batteries |
| JPH09171064A (en) * | 1995-12-19 | 1997-06-30 | Isuzu Motors Ltd | Battery-abnormality warning apparatus |
-
1997
- 1997-09-30 JP JP26606597A patent/JP3863262B2/en not_active Expired - Fee Related
-
1998
- 1998-09-30 DE DE69804935T patent/DE69804935T2/en not_active Expired - Lifetime
- 1998-09-30 US US09/308,445 patent/US6147499A/en not_active Expired - Lifetime
- 1998-09-30 WO PCT/JP1998/004438 patent/WO1999017123A1/en active IP Right Grant
- 1998-09-30 EP EP98945568A patent/EP0943926B1/en not_active Expired - Lifetime
- 1998-09-30 KR KR10-1999-7004721A patent/KR100480911B1/en not_active IP Right Cessation
- 1998-09-30 CN CNB988014351A patent/CN1162711C/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350261C (en) * | 2001-05-29 | 2007-11-21 | 水吉能公司 | Fuel cell votage monitoring system and its method |
| CN100449322C (en) * | 2003-04-29 | 2009-01-07 | 泰拉丁公司 | Measurement circuit with improved accuracy |
| CN100460877C (en) * | 2004-02-23 | 2009-02-11 | 罗姆股份有限公司 | Voltage detecting circuit and battery device using same |
| CN101185005B (en) * | 2005-05-27 | 2011-04-20 | Lg化学株式会社 | Method and apparatus of detecting voltage for battery pack |
| CN101043094B (en) * | 2006-03-23 | 2011-04-06 | 株式会社京浜 | Battery voltage measurement circuit and battery electric control unit |
| CN102520231A (en) * | 2011-12-15 | 2012-06-27 | 大连理工大学 | Detection circuit of switch magnetic resistance motor winding voltage and detection method thereof |
| CN104813178A (en) * | 2012-11-15 | 2015-07-29 | 康奈可关精株式会社 | Voltage measurement circuit |
| CN105378499A (en) * | 2013-07-15 | 2016-03-02 | 古河电气工业株式会社 | Secondary battery state detection device and secondary battery state detection method |
| CN105378499B (en) * | 2013-07-15 | 2018-06-01 | 古河电气工业株式会社 | Secondary cell condition checkout gear and secondary cell condition detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69804935T2 (en) | 2002-08-22 |
| EP0943926B1 (en) | 2002-04-17 |
| WO1999017123A1 (en) | 1999-04-08 |
| JPH11113182A (en) | 1999-04-23 |
| EP0943926A4 (en) | 2000-04-05 |
| US6147499A (en) | 2000-11-14 |
| JP3863262B2 (en) | 2006-12-27 |
| CN1162711C (en) | 2004-08-18 |
| EP0943926A1 (en) | 1999-09-22 |
| DE69804935D1 (en) | 2002-05-23 |
| KR20000069173A (en) | 2000-11-25 |
| KR100480911B1 (en) | 2005-04-07 |
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